Edward e



E. E. BECK.

THREAD CUTTING DIE.

APPLICATION FH.ED 06T.15 1919.

4 1395252. Patented Nov. 1,1921.

UNITED STATES PATENT OFFICE.

EDWARD E. BEGK, OF CHICAGO, ILLIN'OIS, ASSIGNOR '10 CROWN DIE AND TOOL COM- P.A.NY OB CHICAGO, ILLINOIS,

A. CORPORATION DIE ILLINOIS.

THREAID-CUT'IING DIE.

Specificasion 01 Letters Patent.

Patented Nov. 1, 1921.

Application fi1ed October 15, 1919. Seria1 N0. 330,683.

T 0 all whom z't may concem:

Be 1t 11110W11 that 1 EDWARD E. BEOK, 21

citizen 01 the United States residing 2113 Chic21g0, C0011 county, Illinois, have invented certain 110W und useful Improvements in Thread-Qutting Dies, 01 which the follovving, taken in connection with the drawing, is 21 description.

My inventi0n has 101 its object tl1e production 01 a th1ead cutting die designed t0 be used in cutting threads 011 pipes 01: vari- 011s kinds, 011d is particularly desirable f01 use on W01'11 where great care is needed in having the pitch 01' tl1e threads uniform und perfect.

Heretofore it l1as been found that the chasers 01 cutting t00ls Will f0rce the unsupported ends 01 the pipe being threaded laterally, thereby producing an imperfect cutting operation, some 01 the threads being 0ut deep and otl1ers very shallow which frequently resulcs in having to cut new threads, all 01: Whi0h l1as made tl1is kind 0f W01k expensive 011d unsatisfact0ry.

It is 011 0bject 01" 111y invention t0 provide means formed integrally with the chasers 0f the thre0d cutting die 101 holding 011d guiding the sa1ne during tl1e cutting operati011 so that the pitcl1 01 tl1e teeuh 011 the pipe Wlll be formed accurately 011d evenly and always insure a tight j0int when the pipes thus threaded are assembled.

A furher object 01 my invention is 10 produce a thread cutting die having means formed integrally therewiuh 101 guiding 01 directing the operation, Whi0h d0es 11013 require any additional apparatus, attachments 01' device in using tl1e same 011d 0110 Whi0h is simple in construction 011d very eflective in its operation.

111 tl1e aceompanying drawings I have illustrated What 1 110W consider the pre-. ferred 101111 01 an embodiment 0'f 111y invention which Will be fully explained by reference to the description und drawings accompanying tl1is application und t0 tl1e appended claims. In these drawings,

Figure 1, is 21 pla11 view 01 21 th1ead enttin9; die,

Fig. 2, is 011 enlarged seetional view haken through 011e 01 he chasers be1'0re tl1e teeth have been eut back 01 relieved, 011d showing; part 01 the teeth countersunk.

Fig. 3, is a sectional view taken 011 line 33 01 Fig. l, looking in the direction of the arrows, showing the eut back teeth in dotted lines.

Fig. 4, is an enlarged perspective detail 01 011e of the ehasers, looking at the inside thereof.

Fig. 5, is 011 enlerged fragmentary sect1onal detail 01 011e 0f the chasers in posi ti011 when threading a pipe.

Referring t0 the drawings 5 is 11 die plate provided with the usual cutters or chasers, 6789 extending radially int0 the centml opening in the die. It Will be observed filmt the outer 01 cutting edges a 01 these chasers are inclined 110111 a vertical line opp0sed 110 the 'direction 0f rotation 01 the pipe being threaded, shown more clearly in Fig. l. 1

Part 01 the teeth 10 011 ez1ch 01 the chasers have been backend 01T 01 relieved es shown in Figs. 3 and 4, whereby the pitch of the threads are cut 011 21 difierent angle tl12111 the countersunk threads 12 01 the die, 2L11d the z1re 0'f tl1e circle formed by these threads is diiferent fro1n the 010 formed by the other th1eads 011 the chasers, f0r a purpose hereinaiter explained.

O11e t0oth 11 011 each chaser is a guide t00th, und has 21 difi'erent 2110 than the teeth 10. In the threading operation the countersunk teeth 12 011d the guide teeth 11 start the cutting operation 011 ehe pipe being threaded. The guide t0oth 11 is formed 011 21 difierent arc tlmn the otl1er teeth 011d cuts 21 deeper g100ve than the advancing teeth 12 2111d thereby provides sufficient 100111 101 the remaining cutting teeth, 10, whicl1 follOW in the threaded Spital. The t0otl1 11 in euch chaser also forms a bearing against the pipe being threaded, thereby preventing any lateral movement 0f the pipe which results in uneven threads. 1

The teeth 12 011 each chaser are counter- .su11k as Shown 111010 clearly in Figs. 2 and 3. In the beginning of the cutting operation 011 the pipe being threaded, the countersunk tl1reads fi'rst contact with the periphery 0f the pipe being threaded. The die progresses 011 tl1e pipe until the guiding teeth 11 a1e reached, 011d they finisl1 cutting the thread t0 the depth required; tl1e remaining 01 following teeth 10 keeping the pitch of the thread true und accurate during the entire operation.

It Will be observed that the eutting edges a 0f the teeth 0f euch ehuser u1e higher thun the opposite edge b which provides u gruduul eleurunce extending trunsversely of the fuce of' euch ehuser of upproximutely 0f an ineh, m01e er less, whieh prevents un.y tendeney of the eutting edges 0'f the ehusers t0 dig into the pipe during the eutting operutien.

By the use ofthis die 110 bloeks or uny other holding er ulining meehunism is required to be used in the die stock to hold the pipe being threuded. The guiding teeth 11 und 12 ure suflicient to maintuin the pipe in ulinement.

It Will be observed thut the udvuncing 01 eutting edge a of all the threuds 0n euch chuser ure uniformly urrunged, but thut the fuce 0f the leuding er guiding teeth ure cut uwuy towurd the heel of the ehuser und therefore the fuce 0f the eutting teeth 0it' euch ehuser represent an ure of u eircie different fromthe ure 0f die eutting teeth 011 euch chuser Cleurly shown ut a und b in Figs. 1 und 5.

111 this eutting v back 01 relieving the threuds 011 the ehusers, 110 wedging er binding 0'f the threuds 011 the ehusers 01' pipe is efieeted during the eutting operation, the relieved portion b 0f eaeh ehuser, shown more eleurly in Fig. 5, being out of eontuct winh the pipe c during the threuding operation.

I cluimz l. A solid threud eutting die huving an opening through its center, thieuded ehusers disposed rudiully ubout this opening euch of seid ehusers huving one 01 more guiding teeth in front 0f the ehusers formed integrully therewith, ehe fuee 01 euch guiding tooth heilig eutuwuy towurd the heel of the chuse1 und representing u difi'erent u1e 0f u eirele thun the cutting teeth 0f the ehuser.

2. A solid threud eutting die 112L\i11g an opening through its eenter, threuded ehuse1s disposed rudiully ubout suid opening, euch 0f seid chusers huving one 01 mo1e guide teeth fomned integrully therewith, suid guide teeth being formed 011 u difii'0i@ii u1e thun the other teeth 0f the ehuse' und pre- Vidill' u bearing uguinst the pipe heing threuded.

3. A solid threud eutting die huving u eentrul opening, rudiully disposed threuded ehusers in suid die, euch huving one 01 m0re guide teeth formed integruily theiewith und loeuted in front of the th1eud euttinq teeth 0f euch ehusel', the eutting edges 01 suid guide teeth being equul to the 2i1 0:f i;he pipe to be cut und difierent i10ni the u1c 0f u circle 0f the following teeth.

4:. A solid threud eutting die huving u eentrul opening, rudiully disposed chusei's therein, the eutting edges 01 the th1euds 011 seid ehusers being urrunged 011 111'('S e! u ei1ele differing f10n1 the ule of u eircle describing the opposite edge of euch chuser, und gniding teeth intermediute Ehe th1euds on euch chuser.

5. A solid threud cuttinq die huving u centrul opening, rudiully dispesed ehusers projeeting into suid opening, the entting edges of the threuds 011 euch ehuser heing urrunged 011 um a1e 0f u ei1ele cerrespond ing t0 the pipe heilig threuded, the teeth of the threuds vurying trunsversely 0i. the th1euded fuee 0f euch chuser, the udvuneing threuds 011 euch ehuser being countersunk eireumferentiully thereof.

111 testimony whereoi I huve signed this specificution.

EDVARD E. BECK. 

